Code 74 — No high voltage at compressor

What does 74 mean?

The compressor in the outdoor unit is not receiving high voltage power. This prevents the compressor from running.

• No power to the outdoor unit
• Blown fuse or tripped breaker
• Faulty contactor
• Wiring issue to the compressor

Click steps to track your progress.

1. 1

   Verify that power is reaching the outdoor unit (see Code 47).

2. 2

   Check circuit breakers and fuses.

3. 3

   Inspect wiring from the contactor to the compressor.

4. 4

   Contact an HVAC technician for compressor electrical diagnosis.